Larger uPVC frames need steel inside to stay rigid. Here's how we reinforce them.
A galvanised steel insert runs inside the profile to carry the weight of sash and glass and resist wind pressure, keeping larger frames rigid so they don't bow or sag over the years.
Reinforcement is invisible in the finished window, which is why cheap fabrication sometimes skips it. We specify it by size, so your larger frames stay rigid for the long term.
Yes — galvanised steel is inserted into the profile where needed, sized to the span, to keep larger frames rigid against sash, glass, and wind loads.
Larger sliders, doors, and wide casements always; it's assessed by size.
It keeps larger frames from bowing or sagging over time. It's hidden, so cheap fabrication sometimes skips it — we don't.
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